// mixin:混入(函数)
clearDefault()
    appearance: none
    border: none
    outline: none

btn(c,border = false)
    padding 5px 10px
    border: 1px solid c
    color: #fff
    border-radius: 5px
    cursor pointer
    if (border == false)
        background-color c
        color #fff
    else
        color: #000

primaryBtn()
    btn(rgb(249, 205, 173))

primaryBorderBtn()
    btn(rgb(249, 205, 173),true)

infoBtn()
    btn(rgb(131, 175, 155))